It is indicated that the sterical effects gradually become less and less important with dilution. In the case of thirty-fold dilution of the PILs mixture by deuterated solvent for NMR sample, there are standard Multiplicity in Proton NMR (Ma=Nx+1). Will it lead to additional splitting of 1H peaks in case of two-fold dilution or without it at all when R-N-CH3 will get its positive charge R-(NH+)-CH3 form RCOOH, i.e. (-CH3) doublet instead of singlet for example? Or, there is only a chemical shift of (-OH) group will be observed? And what about very strong acids and basics when strong ionicity has occurred?
Dear Andrei Polkovnichenko thank you for posting this interesting technical question. Although I'm not a proven specialist in this field, I just came across a few potentially useful literature references which might help you in your analysis. For example, please have a look at the following article:
Molecular dynamics involving proton exchange of a protic ionic liquid–water mixture studied by NMR spectroscopy
Article Molecular Dynamics involving Proton Exchange of a Protic Ion...
This paper has been posted by the authors as public full text on RG so that you can freely download it as pdf file.
Also please see this relevant paper which is directly related to your question::
Assessing the Structure of Protic Ionic Liquids Based on Triethylammonium and Organic Acid Anions
This paper was published Open Access in The Journal of Physical Chemistry B. It is freely accessilbe as public full text on the internet (please see attached pdf file).
I hope this helps. Good luck with your research and best wishes, Frank Edelmann
Dear Professor Frank T. Edelmann!
Thank you for your reply and contribution. The articles are very useful and interesting in the question respect.
A couple more researches are listed below
Chapter NMR Studies of Protic Ionic Liquids
Article Distillable Protic Ionic Liquids for Keratin Dissolution and Recovery
Dr Andrei, it is expected to split, and maybe multiplet is obtained! Pl keep posted what do you obtain! Thank you
Article Experimental and Theoretical Studies on Compositions, Struct...
Article NMR Studies of Ionic Liquids: Structure and Dynamics
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